The siege of Vicksburg (Mississippi) begins with the Battle of Champion Hill: Major General Ulysses Simpson (a.k.a. Hiram Ulysses) Grant, commanding the compulsory Union Army of the Tennessee defeats the Confederate Army of Vicksburg commanded by Major General John Pemberton.
NOTE: Pemberton retreated into Vicksburg, where Grant, after two failed assaults, decided to lay siege to the city, and wait Pemberton out.
[added 4/8/2022]
Subsequent Events:
References:
Chronology Of The American Civil War
civilwarhome.com/timeline.htm
The Battle of Champion Hill – Wikipedia, the free encyclopedia
en.wikipedia.org/wiki/Battle_of_Champion_Hill
American Civil War, 1863
www.spartacus.schoolnet.co.uk/USAcivilwar4.htm